This study investigates the impact of positive psychological capital (PsyCap) on employee well-being over time. PsyCap, comprising efficacy, hope, optimism, and resilience, has been shown to be related to various employee outcomes, but its long-term effects on well-being have not been previously examined. The study analyzed data from 280 employees, measuring their PsyCap and two measures of psychological well-being (PWB) at two time points. Results indicate that PsyCap is significantly correlated with both measures of PWB and explains additional variance in PWB over time. Specifically, PsyCap at Time 1 explains 3% of the variance in PWB at Time 2 and 2% of the variance in the General Health Questionnaire (GHQ) at Time 2. The study suggests that positive resources like PsyCap can enhance employee well-being and provides preliminary evidence for the role of PsyCap in fostering well-being over time. However, limitations include the inability to establish causality and the potential for common method variance. Future research should explore the long-term effects of PsyCap and incorporate social resources to fully understand its impact on well-being.This study investigates the impact of positive psychological capital (PsyCap) on employee well-being over time. PsyCap, comprising efficacy, hope, optimism, and resilience, has been shown to be related to various employee outcomes, but its long-term effects on well-being have not been previously examined. The study analyzed data from 280 employees, measuring their PsyCap and two measures of psychological well-being (PWB) at two time points. Results indicate that PsyCap is significantly correlated with both measures of PWB and explains additional variance in PWB over time. Specifically, PsyCap at Time 1 explains 3% of the variance in PWB at Time 2 and 2% of the variance in the General Health Questionnaire (GHQ) at Time 2. The study suggests that positive resources like PsyCap can enhance employee well-being and provides preliminary evidence for the role of PsyCap in fostering well-being over time. However, limitations include the inability to establish causality and the potential for common method variance. Future research should explore the long-term effects of PsyCap and incorporate social resources to fully understand its impact on well-being.